[haiku-development] Re: Haiku's configure, -j<n>, and emulated attributes
- From: Michael Crawford <mdcrawford@xxxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Sun, 10 Jan 2010 14:10:32 -0800
I timed a bunch of Linux kernel builds on my Core 2 Quad Xeon box, and
found that I got the fastest builds with -j 8.
One would reasonably expect that you'd get the best time with the same
number of jobs as cores, but my testing showed that was clearly not
the case.
I didn't look into it, but I expect that the reason is that parts of
the build are CPU bound, while other parts of the build are I/O bound.
A job will just block if it has to wait for the disk, and so will
cease doing any useful work. If you then have a CPU bound job ready
to run, useful work proceeds.
I eagerly await the day when I have the cash to buy my second Core 2
Quad. My Supermicro X7DWA-N motherboard is socketed for two Xeons,
but works fine with just one installed. So when I built the box, I
spent as much money as I could on providing a future upgrade path.
FB-DIMM memory though... that's gonna bankrupt me.
Mike
--
Michael David Crawford
mdcrawford at gmail dot com
GoingWare's Bag of Programming Tricks
http://www.goingware.com/tips/
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